Ok, so both seats have established comms. initiated descent and initiated a turn because they thought it was required. Then they run out of useful consciousness. Autopilot carries on.
Is that so implausible?
I have no problem with that as a theory, but in your post earlier you seemed (and maybe I misunderstood ) to be linking the reports of a left turn to the west with what sounds like a pretty much mandatory left turn in the Airbus procedure, hence my comment.
Wiggy, Claybird, if there was a departure from FL, there would have been Alarms generated at the ATCOS station alerting them to the departure of a cleared level, fed from SSR data AND ADSB data
Una -
I don't doubt it ( if as you say, SSR and ADSB are working), but that wasn't the subject of our little discussion - see above.